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https://github.com/xenia-project/FFmpeg.git
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dxtory: compressed RGB555/RGB565 decoding support
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0e1ad2f591
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28e1eed3c2
@ -170,6 +170,8 @@ static int dxtory_decode_v1_444(AVCodecContext *avctx, AVFrame *pic,
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}
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const uint8_t def_lru[8] = { 0x00, 0x20, 0x40, 0x60, 0x80, 0xA0, 0xC0, 0xFF };
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const uint8_t def_lru_555[8] = { 0x00, 0x08, 0x10, 0x18, 0x1F };
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const uint8_t def_lru_565[8] = { 0x00, 0x08, 0x10, 0x20, 0x30, 0x3F };
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static inline uint8_t decode_sym(GetBitContext *gb, uint8_t lru[8])
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{
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@ -188,6 +190,110 @@ static inline uint8_t decode_sym(GetBitContext *gb, uint8_t lru[8])
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return val;
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}
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static inline uint8_t decode_sym_565(GetBitContext *gb, uint8_t lru[8],
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int bits)
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{
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uint8_t c, val;
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c = get_unary(gb, 0, bits);
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if (!c) {
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val = get_bits(gb, bits);
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memmove(lru + 1, lru, sizeof(*lru) * (6 - 1));
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} else {
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val = lru[c - 1];
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memmove(lru + 1, lru, sizeof(*lru) * (c - 1));
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}
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lru[0] = val;
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return val;
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}
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static int dx2_decode_slice_565(GetBitContext *gb, int width, int height,
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uint8_t *dst, int stride, int is_565)
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{
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int x, y;
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int r, g, b;
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uint8_t lru[3][8];
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memcpy(lru[0], def_lru_555, 8 * sizeof(*def_lru));
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memcpy(lru[1], is_565 ? def_lru_565 : def_lru_555, 8 * sizeof(*def_lru));
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memcpy(lru[2], def_lru_555, 8 * sizeof(*def_lru));
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for (y = 0; y < height; y++) {
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for (x = 0; x < width; x++) {
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b = decode_sym_565(gb, lru[0], 5);
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g = decode_sym_565(gb, lru[1], is_565 ? 6 : 5);
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r = decode_sym_565(gb, lru[2], 5);
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dst[x * 3 + 0] = (r << 3) | (r >> 2);
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dst[x * 3 + 1] = is_565 ? (g << 2) | (g >> 4) : (g << 3) | (g >> 2);
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dst[x * 3 + 2] = (b << 3) | (b >> 2);
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}
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dst += stride;
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}
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return 0;
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}
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static int dxtory_decode_v2_565(AVCodecContext *avctx, AVFrame *pic,
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const uint8_t *src, int src_size, int is_565)
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{
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GetByteContext gb;
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GetBitContext gb2;
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int nslices, slice, slice_height;
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uint32_t off, slice_size;
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uint8_t *dst;
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int ret;
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bytestream2_init(&gb, src, src_size);
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nslices = bytestream2_get_le16(&gb);
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off = FFALIGN(nslices * 4 + 2, 16);
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if (src_size < off) {
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av_log(avctx, AV_LOG_ERROR, "no slice data\n");
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return AVERROR_INVALIDDATA;
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}
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if (!nslices || avctx->height % nslices) {
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avpriv_request_sample(avctx, "%d slices for %dx%d", nslices,
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avctx->width, avctx->height);
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return AVERROR_PATCHWELCOME;
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}
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slice_height = avctx->height / nslices;
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avctx->pix_fmt = AV_PIX_FMT_RGB24;
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if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
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return ret;
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dst = pic->data[0];
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for (slice = 0; slice < nslices; slice++) {
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slice_size = bytestream2_get_le32(&gb);
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if (slice_size > src_size - off) {
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av_log(avctx, AV_LOG_ERROR,
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"invalid slice size %d (only %d bytes left)\n",
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slice_size, src_size - off);
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return AVERROR_INVALIDDATA;
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}
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if (slice_size <= 16) {
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av_log(avctx, AV_LOG_ERROR, "invalid slice size %d\n", slice_size);
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return AVERROR_INVALIDDATA;
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}
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if (AV_RL32(src + off) != slice_size - 16) {
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av_log(avctx, AV_LOG_ERROR,
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"Slice sizes mismatch: got %d instead of %d\n",
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AV_RL32(src + off), slice_size - 16);
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}
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init_get_bits(&gb2, src + off + 16, (slice_size - 16) * 8);
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dx2_decode_slice_565(&gb2, avctx->width, slice_height, dst,
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pic->linesize[0], is_565);
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dst += pic->linesize[0] * slice_height;
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off += slice_size;
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}
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return 0;
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}
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static int dx2_decode_slice_rgb(GetBitContext *gb, int width, int height,
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uint8_t *dst, int stride)
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{
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@ -609,11 +715,18 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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ret = dxtory_decode_v1_rgb(avctx, pic, src + 16, avpkt->size - 16,
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AV_PIX_FMT_RGB565LE, 2);
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break;
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case 0x17000009:
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ret = dxtory_decode_v2_565(avctx, pic, src + 16, avpkt->size - 16, 1);
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break;
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case 0x18000001:
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case 0x19000001:
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ret = dxtory_decode_v1_rgb(avctx, pic, src + 16, avpkt->size - 16,
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AV_PIX_FMT_RGB555LE, 2);
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break;
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case 0x18000009:
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case 0x19000009:
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ret = dxtory_decode_v2_565(avctx, pic, src + 16, avpkt->size - 16, 0);
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break;
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default:
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avpriv_request_sample(avctx, "Frame header %X", AV_RB32(src));
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return AVERROR_PATCHWELCOME;
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